Physics Forums: Science Discussion, Homework Help, Expert Commu…

Below short video explain that Einstein equations don't work at large scale and dark matter/energy are just "fix" to make equations try to work. I also know that Einstein theory dont fit in quantum world. I am interested what are the consequences that theory not works in large and micro scale... Read more

Here Tim Maudlin explain that acceleration is not reason why one twin become younger, and that Feynman explained that wrongly? Is this correct and can you explain what he want to say?

Hello What does hydrostatic burning mean in relation to supernova nucleosynthesis ?

Hello What does hydrostatic burning mean in relation to supernova nucleosynthesis ?

Can we use GR to model real world gravitating objects without any reference to Newtonian gravity? There are a lot of interactions between massive particles involving exchange of energy. In Newtonian gravity we have gravitational potential which fits into the framework of classical physics quite... Read more

Deutsches justitzauktion: https://www.zoll-auktion.de/auktion/produkt/1_Bresser_Messier_NT2031000_Spiegelteleskop/977962 It may not be tip-top, and you have to pick it up yourself. But there's only 12 days to the auktion stops and there are no bids yet. Startprice is €250. Sorry if this... Read more

Deutsches justitzauktion: https://www.zoll-auktion.de/auktion/produkt/1_Bresser_Messier_NT2031000_Spiegelteleskop/977962 It may not be tip-top, and you have to pick it up yourself. But there's only 12 days to the auktion stops and there are no bids yet. Startprice is €250. Sorry if this... Read more

I don't understand why people in Michelson-Morley experiment expect that light speed in direction in Earth motion would be light speed + earth speed, if they measure speed from earth frame? Of course, we will get always light speed if we measure speed from Earth frame(as they did). If car travel... Read more

I have been looking at various sources, especially the (now closed) thread on PF classical optics "Coherence, Young's double slit experiments." The trick to making the double slit experiment work with incandescent, as opposed to laser, light is to pass it through an initial single slit 'to make... Read more

I have been looking at various sources, especially the (now closed) thread on PF classical optics "Coherence, Young's double slit experiments." The trick to making the double slit experiment work with incandescent, as opposed to laser, light is to pass it through an initial single slit 'to make... Read more

Here Tim Maudlin explain that acceleration is not reason why one twin become younger, and that Feynman explained that wrongly? Is this correct and can you explain what he want to say?

If you remove all matter in universe when Newton bucket is spinning(water level is still curved), bucket spins in relation to what? How we called this frame?